Blast-furnace.



UNITED STATES ratented october 18, 1904.

PATENT OEEICE.

. ANDREW LATTO AND JAMES C. CALLAN, OF BRADDOCK, PENNSYLVANIA.

BLAST-FURNACE.

SPECIIEICA'lIO1\T forming part of Letters PatentiNO. 772,723, datedOctober 18, 1904. l 'Appncation ined Aprn 9, 1904.. serai No. 202,377.(No model.)

To MZ whom it may con/cern,.-

Be it known that we, ANDREW LATTo,a subject of the King of GreatBritain, and JAMES C. OALLAN, a citizen of the United States of America,both residing at Braddock, in the county of Allegheny and State ofPennsylvania, have invented certain new and usefulIInprovements inBlast-Furnaces, of which Athe following is a specification, referencebeing had therein to the accompanying drawings.

This invention has relation to blast-furnaces, and has for its objectthe provision of means for catching and collecting the dust, dirt, andfragments of ore which are discharged from the top of the furnace by theexplosions which are incident to the operation of furnaces of thischaracter. In carrying our invention into effect we provide a furnacewith a down-comer or dustconduit, within which we arrange anexplosion-door and a screen composed-of tangentially-disposed plates,said conduit or downcomer being connected to'af suitable dust-receptacleand the spaces between the plates of the screencommunicating with theouter air,

so that the smoke and gases from the furnace may escape, while the dust,dirt, and fragments of ore which pass through the conduit willbeprevented from passing into the open air and will be directed into thedustreceptacle, and we further provide a water-spraying appliancelocated adjacent to the said plates, by means of which we spray water inthe path of thedust and drive the dust into the receptacle.

1n the accompanying drawings, Figure 1 is a vertical sectional view ofpart of the upper\ portion of a blast-furnace with our improvementsapplied thereto, and Fig. 2 is a perspective view of our improveddown-comer or dust-collector.

l designates the outer wall of the furnace, and 2 the top thereof. Thefurnace is provided with the usual hopperS and a spreader 4 and in theserespects is of the ordinary and well-known form. An inclined conduit 5is arranged with the top 2 and projects through the outer wall ofthefurnace, and our dust-collecting device is secured to the upper end ofthe conduit 5, being preferably tangentially-disposed plates 14,' thearrange-l ment of the plates being such that outwardlyextending openings15 are left between the I plates for the passage of smoke and productsof combustion from the furnace. Within the part' 7'and in front of thefirst plate is ar- -ranoed a erforated i e 7', receivinoa water from anysuitable source, such pipe being designed to supply jets of water, whichmeeting the dust coming through the door 12 will wet down the dust andprevent it from passing out between the plates.

` The parts being constructed and arranged in the above-described manneroperate as follows: When an explosion takes place'in the furnace or whenfrom any cause dust or fragments of ore or other material are driven tothe top of the furnace, they escape through the conduit 5 and passingthrough the section 7 of the dust-collector are. met and wetted downbythe spray from pipe 7 The smoke and gases escape to the open airthrough the spaces 15 15, while the heavier products impinge against theplates 14 14C, and by reason of the arrangement of these plates theyglance off the plates and fall through the vertical portion 9 into thepipe 11 and thence into the dust-receptacle 6, from which they areremoved from time to time, as occasion requires, through the door 16. l

Having described our invention, we claim- The combination with ablast-furnace, of a conduit communicating with the blast-furnace nearthe top thereof, and a dust-collector composed of 'a curved elbow, adownwardlyextending tube, angularly-disposed plates arranged in saidelbow and having spaces between the plates communicating with the openair.

2. The combination with a blast-furnace, of

IOO

a conduit communicating with the interior thereof, a dust-collectorconnected to said conduit and leading to a dust-receptacle, andangularly-disposed plates arranged in said dustcollector, said platesbeing' spaced apart so as to leave spaces therebetween, whicheommunicate with the open air.

3. In a furnace, the combination of a conduit communicating with theinterior of t'he furnace, an explosion-door arranged at the end of saidconduit, a dust-collector having a curved elbow, and adownwardly-extending portion, a dust receptacle communicating' with saiddownwardly-extending portion, and plates arranged in said elbow at anangle to the elbow and on the outer side of the elbow, said plateshaving downwardly-extending open- H. C. EVERT, E. E. POTTER.

